If you _ the library book,you'll have to pay for it.

问题描述:

If you _ the library book,you'll have to pay for it.
A.fall
B.forget
C.lose
D.leave
写出用法或理由

C 如果你弄丢了图书馆的书 你就要赔
A 降落 B 忘记 C弄丢 D离开